THE URINARY ORGANS. 



165 



5. The urethra differs in structure in the two sexes. In the 

 male the prostatic portion is lined with epithelium resembling that 



FIG. 143. 









Epithelial cells from the mucous membrane of the human bladder. (Rieder.) 

 Fig. 142. From the urinary sediment from a case of cystitis, The cells are somewhat 



swollen after maceration in the altered urine. 

 Fig. 143. Removed from the internal surface of a normal bladder. 



of the bladder. Further forward, it gradually passes into cylin- 

 drical epithelium, at first more than one layer thick ; but in the 



